\begin{tikzpicture}
    \tkzDefPoints{0/0/A, 4/0/B}
    \tkzDefTriangle[two angles=30 and 60](A,B)  \tkzGetPoint{C}
    \tkzDefLine[altitude](A,C,B)  \tkzGetPoint{D}
    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegment(C,D)
    \tkzMarkRightAngle(A,C,B)
    \tkzMarkRightAngle(B,D,C)
    \tkzLabelPoints[left](A)
    \tkzLabelPoints[right](B)
    \tkzLabelPoints[above](C)
    \tkzLabelPoints[below](D)
\end{tikzpicture}

